refactor: picker component to only post message with block info [FC-0062]

[navinkarkera]

Description

The picker component will not call any api on selection.

Supporting information

For: openedx/edx-platform#35670

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.12%. Comparing base (a94df2f) to head (b91d86d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1401      +/-   ##
==========================================
- Coverage   93.13%   93.12%   -0.01%     
==========================================
  Files        1050     1050              
  Lines       20163    20140      -23     
  Branches     4269     4269              
==========================================
- Hits        18778    18755      -23     
  Misses       1322     1322              
  Partials       63       63              

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[bradenmacdonald]

Seems great, thanks! I tested this with the corresponding platform PR and it's working well.

If there's any follow-up improvements needed (e.g. to fix the button situation as I commented on the other PR), please just open a new PR.